November 26, 2015

Homework Help: chemistry

Posted by Mahir on Thursday, October 29, 2009 at 7:59pm.

1. The bombardier beetle uses an explosive discharge as a defensive measure. The chemical reaction involved is the oxidation of hydroquinone by hydrogen peroxide to produce quinine and water:
C6H4(OH)2 (aq) + H2O2 (aq) �� C6H4O2 (aq) + 2 H2O (l)
Calculate ΔH for this reaction from the following data:
C6H4(OH)2 aq --> C6H4O2 aq + H2 g ΔH = +177.4 kJ
H2 g + O2 g --> H2O2 aq ΔH = -191.2 kJ
H2 g + O2 g --> H2O g ΔH = -241.8 kJ
H2O g --> H2O (L) ΔH = -43.8 kJ

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